Robust Algorithms For Adaptive Array Signal Processing

The bandwidth of performance of adaptive array with tapped delay-line behind each element is examined in this paper .It is shown how the number of taps and the delay between taps affect the bandwidth performance of the array. On the base of the study, we analyze the relationship between tapped delay-line and FFT processing in adaptive arrays.In this paper, several robust beamforming techniques have been proposed .One of them is based on array calibration .It employs the beamformers output power as an objective function to correct DOA mismatch. This method causes no loss in the degree of freedom in interference rejection, and its computation cost is low. since the calibration is reouired only when there are detectable changed in signal scenarios, e.g., DOA mismatch. The constrained-based methods are easy to implement, but the constraints introduced can reduce the beamformers degree of freedom in interference rejection. Another type of algorithm was proposed in this letter, this method could be regarded as an extension of the first method.Adaptive sidelobe cancellation technique is another effective measures of counter-jamming. This paper presents a novel algorithm for adaptive sidelobe cancellation. The weight vector of the novel algorithm is calculated by projecting the weight vector of the conventional algorithm into the interference subspace of the auxiliary channels' correlation matrix.